logo image does not show on mobile device browser

I have made a website, where the logo looks ok when I open it in my laptop browser. However, it doesn't show up in my iPhone or iPad browser. I tried Safari, Chrome, Brave, the same...

I have found another stackoverflow questions, the answer says it's because the image size, but I don't think so. My original size is only 1310x242 pixel. and I also tried to reduce the size to only 300x56. It still doesn't show.

Your help is highly appreciated!